<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .parent {
                border: 2px solid #333;
                width: 100px;
                height: 100px;
                position: relative;
              }
        .test {
              width: 40px;
              height: 40px;
              background-color: pink;
              position: absolute;
              top: 25px;
              left: 0;
         }
    </style>
</head>
<body>
    <div class="parent">
        <div class="test"></div>
    </div>
</body>
</html>